Improvement in double heating-grates



.ZSheets-Sheet1.

E. A. JACKSON.

DOUBLE HEATING-GRAIE.

Ng 17z 569 Patented J'an.25,1876.

N. PETERS. PHOTULI TNOGRAPHER, WASHINGTON. D C.

2 Sheets--Shet 2.

E. JACKSON. DOUBLE HEATING-GRATE.

Patented Jan. 25., 1876.

U rrEn STATES EDWIN A. memory, on NEW YORK, N.

IMPROVEMENT IN DOUBLE HEATING-GRATES.

Specification formingpart of LettersPatent N 0. 172,569, dated January25, 1876 November 11, 1875.

To all whom it may concern:

Be it known that I, EDWIN A. JACKSON, of the city and county of NewYork, in the State of New York, have invented certain new and usefulImprovements in Double Heating- Grates, of which the followingspecification is a full, clear, and exact description, reference beinghad to the accompanying drawings forming part of this specification.

In the drawings, Figure 1 represents afront View of my doubleheating-grate, with its customary adjuncts, and with the valve S, whichadmits a free, direct draft up the chimney, partly-drawn forward. Fig. 2is a vertical section through the line as m, Fig. 1, showing theinternal arrangement of the heating apparatus; and Fig. 3 is ahorizontal section, looking from the back of the apparatus through theline Y Y, Fig. 2, showing the chamber 0, and the openings T T into thepipes U U.

Like letters refer to like parts in all the views.

The object of my invention is to retain the advantages of radiant heatfrom an open fire, and also an unobstructed ventilation that an opengrate affords, and at the same time arrest and utilize a largepercentage of the heat which, with grates of ordinary construction,escapes up the chimney with the products of combustion, and toaccomplish this without any return draft, or descending fines, which arevery objectionable, especially when the chimney has not a very strongdraft.

The invention consists in the peculiar arrangement, in connection with agrate of ordinary construction, of three heating-chain bers of novelconstruction, through which the air is progressively conducted, (beingheated to a higher temperature in the second than in the first, andstill more highly heated in the third), from its entrance into theapparatus until its exitinto the apartment to be warmed.

In the drawings, A represents the front casing of the apparatus, havingthe molding of the configuration shown at B, or any other approvedornamentation thereon. O is the grate, of any approved construction, anddetachably placed in position. The apparatus is set in the fire-placewith the chamber D resting upon the hearth E. The upperplate applicationfiled of this chamber D is directly under the fire, and constitutes thereceptacle for the ashes falling from the grate C; and through thebottom plate is acircular opening, F, to which is connected, by aflange, a five-inch pipe, G, which extendsoutside of the building, forthe purpose ofadmittin g fresh air to the apparatus through the chamberD. If, because of the location of the fire-place, it be foundinconvenient to admitthe air into the chamber D directly from withoutthe building, it may be admitted from the room in which the grate issituated, through the openings H H in the front of said chamber. Theseinlets, which should be kept closed when air is admitted through pipe G,are opened. and closed by means of a slide operated by the knob J.

Resting upon the chamber D is the second chamber K, against which thecoals in the grate rest, without the intervention of a soapstone orfire-brick lining. The inside shell of this chamber has at its bottomaflange at right angles thereto, which is screwed or bolted to the topof chamber D, as shown at L, and at its top it is likewise secured tothe outer shell of the apparatus, as seen at M. Communication betweenthe chamber K, thus constructed, and the lower chamber D, is formed by aseries of openings, N. The third chamber, 0, directly over the tire, ispreferably of the form shown, and is secured by screws or bolts, asshown at P and Q, to chamber K, at about the inclination shown in thedrawing. This chamber 0 is perforated by a series of conically-shapedfines, R, forming within said chamber aseries of conical tubes. When thevalve S is entirely closed, the products of combustion mustpass throughthese openings R.

These conical tubes or openings are made larger at the bottom or inletthan at the top or outlet. so as to present a better surface to the firebeneath, and also not so readily allow the products of combustion toescape before the heat is extracted by the air, which has passed up fromthe second chamber of the series into the chamber 0, and is circulatingaround said tubes, previous to its entrance through the openings T Tinto the pipes UU, which conduct it to the apartment to be warmed. Thevalve S is loosely pivoted at @5011 end, V, tothe outer casing of theapopenings T T with chamber 0 are the pipes U U, through which the air,after being heated in the chalnberO, is conducted to the apartment to bewarmed, making its exit through the ornamental outlets X X at the uppercorners of the casing-of the apparatus.

The air-chamber D beneath the grate serves to keep the hearthcomparatively cool, so that if there be-wood-work in close proximity toor underneath the fire-place," the same will be in no danger of takingfire. v

The operation of the apparatus is as follows: It being placed inposition, as previously explained, with the pipe for the admission ofthe cool air properly attached at the point F, the valve S is opened ordrawn entirely forward, and the. fire kindled in the grate. After thecoals have become thoroughly ignited, the valve S is thrown back uponthe top W of the chamber 0. The products of combustion have now no othermeans of escape up the chimney, except through the conical openings R,and while these openings are ample for the purpose designed, they yet,by reason of their peculiar construction, prevent the too rapid escapeof the heated gases, and they are thus utilized in heating the tubeswithin the chamber 0, around which the air,

as admitted from the chamber below, cinculates, and is still more highlyheated before making its final exit. The cold air, admitted through pipeG into chamber D, where it is partially heated, rises through openings NN into chamber where it is more highly heated, and is thence conductedinto the third' chamber of the series 0, where it circulates around theconical tubes extending through said chamber, and is still more highlyheated by the products of combustion passing through the conicalopenings. The heat, as it is extracted from the air in the chamber 0,passes through the openings T T, and is thence conducted through pipes UU into the apartment to be heated, as before explained. I 1-;

Having thus described my invention, what I claim as new, and desire tosecure by Let ters Patent, is

1. In a fire-place grate, the combination ,of the air-heating chambersD, K, and O, the latter being provided with the series of tubular smokepassages R, substantially as described, for the purpose specified.

2. In combination with the air-heatingcham her 0, having a series oftubular smoke-passages, the pivoted damper S, substantially as and forthe purpose specified. 7

3. The combination of the air-heat-in g chamber 0, having theupwardly-contracted smokepassages described,-with the lower chambers Dand K and the discharging-passages. U, substantially as and for thepurpose described.

EDWIN A. JACKSON.

Witnesses:

J NO. H. HANKrNsoN, HORACE FoaBUsH.

